examples/android/app/src/main/java/com/tensorspeech/tensorflowtts/MainActivity.java
package com.tensorspeech.tensorflowtts;

import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.RadioGroup;

import androidx.appcompat.app.AppCompatActivity;

import com.tensorspeech.tensorflowtts.dispatcher.OnTtsStateListener;
import com.tensorspeech.tensorflowtts.dispatcher.TtsStateDispatcher;
import com.tensorspeech.tensorflowtts.tts.TtsManager;
import com.tensorspeech.tensorflowtts.utils.ThreadPoolManager;

/**
 * @author {@link "mailto:hzdkv@example.com" "Xuefeng Ding"}
 * Created 2020-07-20 17:25
 */
public class MainActivity extends AppCompatActivity {
    private static final String DEFAULT_INPUT_TEXT = "Unless you work on a ship, it's unlikely that you use the word boatswain in everyday conversation, so it's understandably a tricky one. The word - which refers to a petty officer in charge of hull maintenance is not pronounced boats-wain Rather, it's bo-sun to reflect the salty pronunciation of sailors, as The Free Dictionary explains./Blue opinion poll conducted for the National Post.";

    private View speakBtn;
    private RadioGroup speedGroup;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        TtsManager.getInstance().init(this);

        TtsStateDispatcher.getInstance().addListener(new OnTtsStateListener() {
            @Override
            public void onTtsReady() {
                speakBtn.setEnabled(true);
            }

            @Override
            public void onTtsStart(String text) {
            }

            @Override
            public void onTtsStop() {
            }
        });

        EditText input = findViewById(R.id.input);
        input.setHint(DEFAULT_INPUT_TEXT);

        speedGroup = findViewById(R.id.speed_chooser);
        speedGroup.check(R.id.normal);

        speakBtn = findViewById(R.id.start);
        speakBtn.setEnabled(false);
        speakBtn.setOnClickListener(v ->
                ThreadPoolManager.getInstance().execute(() -> {
                    float speed ;
                    switch (speedGroup.getCheckedRadioButtonId()) {
                        case R.id.fast:
                            speed = 0.8F;
                            break;
                        case R.id.slow:
                            speed = 1.2F;
                            break;
                        case R.id.normal:
                        default:
                            speed = 1.0F;
                            break;
                    }

                    String inputText = input.getText().toString();
                    if (TextUtils.isEmpty(inputText)) {
                        inputText = DEFAULT_INPUT_TEXT;
                    }
                    TtsManager.getInstance().speak(inputText, speed, true);
                }));

        findViewById(R.id.stop).setOnClickListener(v ->
                TtsManager.getInstance().stopTts());
    }
}
